Welcome! i used to have a ratty named Lucy, i had her with her sister Isabelle.... i thought the names were cute together! Oreo is an adorabe name too! What do your ratties look like?! Pictures!
how long has she been alone though? think about getting her a Little babe! or you can go all out and get 2 little ones! they have a tendency of being introduced more smoothly. They love playing together!
give your lone ratties lots of attention, sometimes being alone makes them more timid/skittish.